Shrub up to 3 m high; twigs sparsely to moderately clothed in appressed hairs when young, becoming ± glabrous, furrowed; spines stout, simple, scattered, 10-40 mm long. Lvs glabrous above, sericeous below, petiolate, usually 3-foliolate; leaflets obovate, cuneate, mucronate or obtuse, 4-10-(12) mm long; petiolules ± equal. Fls mostly solitary, axillary, sometimes few in fascicles; pedicels 4-8 mm long; bracteoles subtending calyx usually 3-fid. Calyx remnant sparsely to moderately clothed in appressed hairs. Corolla yellow, 10-15 mm long. Pod usually glabrous or sometimes sparsely hairy along suture, narrowly oblong, 3-8-seeded, 30-40 mm long; sutures somewhat thickened and sometimes winged; seeds yellowish brown, smooth, flattened.